核电厂蒸汽发生器管板异物分析评价

Analysis and Evaluation on the Foreign Objects on the Steam Generator Tube Sheet of a Nuclear Power Plant

采用ARCHARD磨损物理模型和碰撞分析冲击能计算方法对某核电厂蒸汽发生器管板残留异物进行分析评价。结果表明:保守假设异物已经对传热管产生了20%壁厚磨损减薄,极限条件下传热管仍能够安全运行至少3个有效满功率年。此外,异物碰撞传热管形成的凹痕仅为传热管壁厚的0.025%,异物冲击传热管的能量足够低,异物对传热管的碰撞影响可忽略不计。

The residual foreign objects on the steam generator tube sheet of a nuclear power plant were analyzed and evaluated by ARCHARD wear physical model and impact energy calculation method for collision analysis. Results showed that if the conservative assumption was that the foreign objects resulted in a wear reduction of 20% of the wall thickness of the tube, the heat transfer tube could still work safely for at least 3 years with effective full power under extreme conditions. In addition, the indentation formed by the collision from the foreign objects on the tube was only 0.025% of the wall thickness, and the impact energy of the foreign objects was low enough, so the impact of the foreign objects on the tube could be ignored.